<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        const arr = ['suda', 'nihao', 'sjhs','hello']
        //性能较差，return无法终止
        // arr.forEach((item, index) => {
        //     console.log('ok')
        //     if (item === 'sjhs') {
        //         console.log(index)
        //         return
        //     }
        // })

        arr.some((item, index) => {
            console.log('ok')
            if (item === 'sjhs') {
                console.log(index)
                return true
            }
        })
    </script>
</body>
</html>